Switch to Java 17 as default (#195)

Switches sample to Java 17 as default. 

Additional space added to the Java backend to accommodate downloaded
JRE. Sidecar is also grew bigger.

Author: vmikhailenko

.github/workflows/maven.yml

@@ -16,9 +16,9 @@ jobs:
 
     steps:
     - uses: actions/checkout@v2
-    - name: Set up JDK 1.8
+    - name: Set up JDK
       uses: actions/setup-java@v1
       with:
-        java-version: 1.8
+        java-version: 17
     - name: Build with Maven
       run: mvn -B clean install

README.md

@@ -207,6 +207,7 @@ Prerequisites:
 - Get an SAP Business Technology Platform account to deploy the services and applications.
 - [Create a SAP HANA Cloud Instance](https://developers.sap.com/tutorials/hana-cloud-deploying.html) in your SAP Business Technology Platform space.
 - Ensure you have an entitlement for `SAP HANA Schemas & HDI Containers` with plan `hdi-shared` in the same space.
+- Ensure that your CF instances are connected to Internet to download SAPMachine JRE 17 as it is available in `sap_java_buildpack` in online mode only.
 
 Deploy as Single Tenant Application:
 - Rename `mta-single-tenant.yaml` to `mta.yaml`

mta-multi-tenant.yaml

@@ -18,11 +18,13 @@ modules:
     path: srv
     parameters:
       memory: 1024M
-      disk-quota: 256M
+      disk-quota: 512M
       buildpack: sap_java_buildpack
     properties:
       SPRING_PROFILES_ACTIVE: cloud,sandbox
       CDS_MULTITENANCY_APPUI_TENANTSEPARATOR: "-"
+      JBP_CONFIG_COMPONENTS: "jres: ['com.sap.xs.java.buildpack.jre.SAPMachineJRE']"
+      JBP_CONFIG_SAP_MACHINE_JRE: '{ use_offline_repository: false, version: 17.+ }'
     build-parameters:
       builder: custom
       commands:
@@ -50,7 +52,7 @@ modules:
     path: mtx-sidecar
     parameters:
       memory: 256M
-      disk-quota: 512M
+      disk-quota: 1024M
     requires:
       - name: bookshop-mt-service-manager
       - name: bookshop-mt-uaa

mta-single-tenant.yaml

@@ -12,10 +12,12 @@ modules:
     path: srv
     parameters:
       memory: 1024M
-      disk-quota: 256M
+      disk-quota: 512M
       buildpack: sap_java_buildpack
     properties:
-      SPRING_PROFILES_ACTIVE: cloud,sandbox
+        SPRING_PROFILES_ACTIVE: cloud,sandbox
+        JBP_CONFIG_COMPONENTS: "jres: ['com.sap.xs.java.buildpack.jre.SAPMachineJRE']"
+        JBP_CONFIG_SAP_MACHINE_JRE: '{ use_offline_repository: false, version: 17.+ }'
     build-parameters:
       builder: custom
       commands:

pom.xml

@@ -15,7 +15,7 @@
 		<revision>1.0.0-SNAPSHOT</revision>
 
 		<!-- DEPENDENCIES VERSION -->
-		<jdk.version>1.8</jdk.version>
+		<jdk.version>17</jdk.version>
 		<cds.services.version>1.31.0</cds.services.version>
 		<spring.boot.version>2.7.8</spring.boot.version>
 		<cloud.sdk.version>4.5.0</cloud.sdk.version>
@@ -76,8 +76,7 @@
 				<artifactId>maven-compiler-plugin</artifactId>
 				<version>3.8.1</version>
 				<configuration>
-					<source>${jdk.version}</source>
-					<target>${jdk.version}</target>
+					<release>${jdk.version}</release>
 					<encoding>UTF-8</encoding>
 				</configuration>
 			</plugin>